diff --git a/neo3-gui/neo3-gui/ClientApp/package-lock.json b/neo3-gui/neo3-gui/ClientApp/package-lock.json
index 6771a28..67f5135 100644
--- a/neo3-gui/neo3-gui/ClientApp/package-lock.json
+++ b/neo3-gui/neo3-gui/ClientApp/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "neo-gui",
-  "version": "1.2.1",
+  "version": "1.2.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/neo3-gui/neo3-gui/ClientApp/package.json b/neo3-gui/neo3-gui/ClientApp/package.json
index 703f470..8bbb880 100644
--- a/neo3-gui/neo3-gui/ClientApp/package.json
+++ b/neo3-gui/neo3-gui/ClientApp/package.json
@@ -1,6 +1,6 @@
 {
     "name": "neo-gui",
-    "version": "1.2.2",
+    "version": "1.2.3",
     "private": true,
     "main": "main.js",
     "homepage": "./",
diff --git a/neo3-gui/neo3-gui/Helpers.cs b/neo3-gui/neo3-gui/Helpers.cs
index 352672e..de086da 100644
--- a/neo3-gui/neo3-gui/Helpers.cs
+++ b/neo3-gui/neo3-gui/Helpers.cs
@@ -305,10 +305,10 @@ public static string SafeSerialize(this ContractParametersContext signContext)
         /// <param name="script"></param>
         /// <param name="signers"></param>
         /// <returns></returns>
-        public static Transaction InitTransaction(this Wallet wallet, byte[] script, params UInt160[] signers)
+        public static Transaction InitTransaction(this Wallet wallet, byte[] script, UInt160 sender = null, params UInt160[] signers)
         {
             var cosigners = signers.Select(account => new Signer { Account = account, Scopes = WitnessScope.Global }).ToArray();
-            return InitTransaction(wallet, script, cosigners);
+            return InitTransaction(wallet, script, sender, cosigners);
         }
 
         /// <summary>
@@ -316,11 +316,12 @@ public static Transaction InitTransaction(this Wallet wallet, byte[] script, par
         /// </summary>
         /// <param name="wallet"></param>
         /// <param name="script"></param>
+        /// <param name="sender"></param>
         /// <param name="signers"></param>
         /// <returns></returns>
-        public static Transaction InitTransaction(this Wallet wallet, byte[] script, params Signer[] signers)
+        public static Transaction InitTransaction(this Wallet wallet, byte[] script, UInt160 sender = null, params Signer[] signers)
         {
-            var tx = wallet.MakeTransaction(GetDefaultSnapshot(), script, null, signers, maxGas: 2000_00000000);
+            var tx = wallet.MakeTransaction(GetDefaultSnapshot(), script, sender, signers, maxGas: 2000_00000000);
             return tx;
         }
 
diff --git a/neo3-gui/neo3-gui/Models/ErrorCode.cs b/neo3-gui/neo3-gui/Models/ErrorCode.cs
index 67a1501..2ff64e1 100644
--- a/neo3-gui/neo3-gui/Models/ErrorCode.cs
+++ b/neo3-gui/neo3-gui/Models/ErrorCode.cs
@@ -64,7 +64,7 @@ public enum ErrorCode
         UnknownContract = 20028,
         [Description("Contract already onchain.")]
         ContractAlreadyExist = 20029,
-        [Description("Validator already exits.")]
+        [Description("Validator already exists.")]
         ValidatorAlreadyExist = 20030,
         [Description("No gas for claim.")]
         NoNeedClaimGas = 20031,
diff --git a/neo3-gui/neo3-gui/Services/ApiService.cs b/neo3-gui/neo3-gui/Services/ApiService.cs
index 653c16f..b80b42f 100644
--- a/neo3-gui/neo3-gui/Services/ApiService.cs
+++ b/neo3-gui/neo3-gui/Services/ApiService.cs
@@ -37,14 +37,12 @@ protected WsError Error(int code, string message)
             return new WsError() { Code = code, Message = message };
         }
 
-
-
-        protected async Task<object> SignAndBroadcastTx(byte[] script, params UInt160[] signers)
+        protected async Task<object> SignAndBroadcastTxWithSender(byte[] script, UInt160 sender, params UInt160[] signers)
         {
             Transaction tx;
             try
             {
-                tx = CurrentWallet.InitTransaction(script, signers);
+                tx = CurrentWallet.InitTransaction(script, sender, signers);
             }
             catch (InvalidOperationException ex)
             {
@@ -68,5 +66,10 @@ protected async Task<object> SignAndBroadcastTx(byte[] script, params UInt160[]
             result.TxId = tx.Hash;
             return result;
         }
+
+        protected async Task<object> SignAndBroadcastTx(byte[] script, params UInt160[] signers)
+        {
+            return await SignAndBroadcastTxWithSender(script, null, signers);
+        }
     }
 }
\ No newline at end of file
diff --git a/neo3-gui/neo3-gui/Services/ApiServices/ContractApiService.cs b/neo3-gui/neo3-gui/Services/ApiServices/ContractApiService.cs
index 09505e6..bbc7dd9 100644
--- a/neo3-gui/neo3-gui/Services/ApiServices/ContractApiService.cs
+++ b/neo3-gui/neo3-gui/Services/ApiServices/ContractApiService.cs
@@ -185,7 +185,7 @@ public async Task<object> InvokeContract(InvokeContractParameterModel para)
 
             try
             {
-                tx = CurrentWallet.InitTransaction(sb.ToArray(), signers.ToArray());
+                tx = CurrentWallet.InitTransaction(sb.ToArray(), null, signers.ToArray());
             }
             catch (InvalidOperationException ex)
             {
@@ -428,8 +428,7 @@ public async Task<object> ApplyForValidator(string pubkey)
             var account = contract.ScriptHash;
             using ScriptBuilder sb = new ScriptBuilder();
             sb.EmitDynamicCall(NativeContract.NEO.Hash, "registerCandidate", publicKey);
-
-            return await SignAndBroadcastTx(sb.ToArray(), account);
+            return await SignAndBroadcastTxWithSender(sb.ToArray(), account, account);
         }
 
 
diff --git a/neo3-gui/neo3-gui/config.testnet.json b/neo3-gui/neo3-gui/config.testnet.json
index 63791b4..8ffc58a 100644
--- a/neo3-gui/neo3-gui/config.testnet.json
+++ b/neo3-gui/neo3-gui/config.testnet.json
@@ -1,48 +1,45 @@
 {
   "ApplicationConfiguration": {
     "Logger": {
-      "Path": "Logs",
-      "ConsoleOutput": true,
-      "Active": true
+      "Path": "Logs_{0}",
+      "ConsoleOutput": false,
+      "Active": false
     },
     "Storage": {
       "Engine": "LevelDBStore",
-      "Path": "Data_LevelDB_6713213"
+      "Path": "Data_LevelDB_827601742"
     },
     "P2P": {
-      "Port": 21333,
-      "WsPort": 21334
+      "Port": 30333,
+      "WsPort": 30334
     },
     "UnlockWallet": {
-      "Path": "0.json",
-      "Password": "123456",
-      "IsActive": true
+      "Path": "",
+      "Password": "",
+      "IsActive": false
     },
     "PluginURL": "https://github.com/neo-project/neo-modules/releases/download/v{1}/{0}.zip"
   },
   "ProtocolConfiguration": {
-    "Magic": 6713213,
+    "Magic": 827601742,
     "MillisecondsPerBlock": 15000,
     "MaxTraceableBlocks": 2102400,
     "ValidatorsCount": 7,
     "StandbyCommittee": [
-      "02179543000184781e5447b3f0fbace664ea92b7e31227c8e71bc4e7cdafccdb8e",
-      "038415d0be8dc12b61d3e3b76b98f464dfab7fddee74271c35e2de624bb51023a6",
-      "03c9b1c89c6e2d4abd629a2db8b7d03aced518a56793bc90f4985ef7ed3f1b481a",
-      "0302242b1dced63e1bf7eb14876f7ef026b79567f9c5be83de1943dd185ec28e68",
-      "025e8494903b93dc369f08a2bd7e221f574c75d9675591f04907cba9daeeb83d10",
-      "03e8ab5186e1deabcd10ec0e509ded4fffade6fddf534ac3e0506268bae3fd44a6",
-      "020df8858b66ff4d7b0a6a68d11ddedcc7d90d2a64ffa2cd087c4c5dabf4150b40",
-      "02f5f04a6036caedd68b5bd36e33105c0e9f43c0592e9f9f2188b1659be993bb5e",
-      "0279ed5e9ed91547e332a4f27135eebff5daab6c978b57992d8ee0359ccb9f5e8b",
-      "02ff249d06faaf0b5ba865e1531bfabe07f89aef39ab59082e3bc140be0318055d"
+      "023e9b32ea89b94d066e649b124fd50e396ee91369e8e2a6ae1b11c170d022256d",
+      "03009b7540e10f2562e5fd8fac9eaec25166a58b26e412348ff5a86927bfac22a2",
+      "02ba2c70f5996f357a43198705859fae2cfea13e1172962800772b3d588a9d4abd",
+      "03408dcd416396f64783ac587ea1e1593c57d9fea880c8a6a1920e92a259477806",
+      "02a7834be9b32e2981d157cb5bbd3acb42cfd11ea5c3b10224d7a44e98c5910f1b",
+      "0214baf0ceea3a66f17e7e1e839ea25fd8bed6cd82e6bb6e68250189065f44ff01",
+      "030205e9cefaea5a1dfc580af20c8d5aa2468bb0148f1a5e4605fc622c80e604ba"
     ],
     "SeedList": [
-      "seed1t.neo.org:21333",
-      "seed2t.neo.org:21333",
-      "seed3t.neo.org:21333",
-      "seed4t.neo.org:21333",
-      "seed5t.neo.org:21333"
+      "seed1t.neo.org:20333",
+      "seed2t.neo.org:20333",
+      "seed3t.neo.org:20333",
+      "seed4t.neo.org:20333",
+      "seed5t.neo.org:20333"
     ]
   }
-}
\ No newline at end of file
+}